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Icom IC-A110 Service Manual

Icom IC-A110
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4 - 3
4-2 PLL ADJUSTMENT
Vdd
VOLTAGE
PLL LOCK
VOLTAGE
TUNE
VOLTAGE
REFERENCE
FREQUENCY
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1
1
2
1
1
• Operating frequency :
118.000 MHz
• Receiving
• Operating frequency :
118.000 MHz
• Receiving
• Transmitting
• Operating frequency :
118.000 MHz
• Receiving
• Operating frequency :
136.950 MHz
• Connect an RF power meter or a
50 dummy load to the antenna
connector.
• Transmitting
MAIN
MAIN
MAIN
Rear
panel
Connect a digital
multi-meter to drain
terminal of Q51.
Connect a digital
multi-meter to the
check point CP2.
Connect a digital
multi-meter to the
check point CP1.
Loosely couple the
frequency counter
to the antenna con-
nector.
13.5 V
0.5 V
0.5 V
0.7 V
136.9500 MHz
MAIN
MAIN
MAIN
MAIN
R392
L41
L40
R59
X1
4-3 TRANSMITTER ADJUSTMENT
OUTPUT
POWER
MODULATION
DEPTH
HEAD SET
MODULATION
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1
1
2
1
• Operating frequency :
127.000 MHz
No audio applied to the [MIC]
jack.
• Transmitting
• Operating frequecy :
127.000 MHz
Connect an audio generator to
the [MIC] jack and set as :
1 kHz/10 mVrms
• Set a modulation analyzer as :
HPF : OFF
LPF : OFF
De-emphasis : OFF
Detector : (P–P)/2
Pre-set R110 and R121 on the
MAIN unit to the center position.
• Transmitting
• Set an audio generator as:
1 kHz/1 mVrms
• Transmitting
• Operating frequency :
127.000 MHz
Connect an audio generator to
the [EXT MIC] jack and set as :
1 kHz/1 mVrms
• Transmitting
Rear
panel
Rear
panel
Rear
panel
Connect an RF
power meter to the
antenna connector.
Connect a modula-
tion analyzer to the
antenna connector
through an attenua-
tor.
Connect a modula-
tion analyzer to the
antenna connector
through an attenua-
tor.
9.0 W
90 %
30 %
30 %
MAIN
MAIN
MAIN
R150
R121
R110
R336

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Icom IC-A110 Specifications

General IconGeneral
Frequency Range118.000–136.975 MHz
Channel Spacing25 kHz / 8.33 kHz
Power Supply Requirement13.75 V DC ±15%
Output Power36W (PEP), 9W (carrier)
Dimensions150 × 50 × 180 mm (W × H × D)
ModulationAM
Operating Temperature Range-20°C to +55°C –4°F to +131°F

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